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BAE SYSTEMS DESIGN PROJECT:DAYLIGHTING TECHNIQUES/
AFTERNOON DE-”LIGHT”
EDSGN 100 Sec. 6 Team 3:
David Young, Robert Vadella, Victoria Rodriguez, Phil Bisker, Domonique Trujillo
Abstract
Each day, large quantities of electricity are used to light homes and office buildings. As the cost of energy rises, it is important to find alternative methods of providing light to interior spaces. The objective of this project was to design an energy efficient and cost efficient structure.
Introduction: Daylighting
In homes, it is the process of using natural light to illuminate rooms Reduces the need for
electric lighting Aesthetics: Visual Comfort
Different Methods of Daylighting Windows, Skylights, Solar
Tubes, Glazing Techniques, Translucent Wall Paneling
Benefits of Natural Lighting
There are many benefits to natural lighting Studies have proven that effective daylighting
can make people more comfortable and productive Reduced absenteeism for employees and students Reduced eye strain Higher productivity
Increased use of natural as opposed to artificial lighting can reduce electricity consumption Lowering energy costs
Natural Lighting with Windows
Energy can be conserved by using natural light through windows and skylights Conserves electricity
More windows require more energy for heating and cooling a home Costing energy
Description of Design Task
Problem Statement As the cost of energy increases, solar power is becoming
more common in new homes. Lighting interior spaces with electricity can consume large amounts of energy.
Important to find ways to reduce lighting costs while at the same time providing a sufficient amount of light.
Energy Conservation Mission Statement
The group’s mission is to design an efficient method for lighting a solar home. We have identified various ways of achieving this goal, including skylights, light shelves, “smart” glass and windows, glazing techniques, translucent wall panels, and solar tubes
Our task was to choose the best possible technique, or combination of techniques, that will allow for maximum daylighting with minimum energy costs.
Design Specifications Provide the most cost effective and energy
efficient method for daylighting that meets the requirements of the consumer.
Customer Needs Assessment Cost Effective Easy to Install and Maintain Energy Efficient Durability Aesthetics
Design Approach
Concept Selection Skylights: Location in
roof removes space for solar panels. Condensation can also occur (weeping).
Light Shelves: Not suitable for cold climates, not aesthetically pleasing
“Smart” Windows” (change from clear to opaque): Expensive, require electricity to operate
Concepts Selected
Window Glazing: Easy to install, suitable for cold and moderate climates, allows more light than tinted windows while reducing energy loss
Solar Tubes: Cost Effective, increases natural light in rooms with few windows, can be used in any room.
Translucent Wall Panels: Provide higher thermal resistance than windows while allowing light to enter rooms, durable
Solar Tubes
Extend from the roof of a home to the ceiling of the desired room
Can provide natural light to rooms Dimmers can be installed to control the
intensity of light Fewer leaks and less heat loss than
skylights Amount of light depends on size of tube
One 10” Solar Tube can light an area of up to 150 ft2
Reflective technology allows a sufficient amount of light on cloudy days Results in minimal light loss
Window Glazing
Glass coating Increases the energy efficiency of windows and keeps
heat from escaping. In most U.S. climates, low-E coatings reduce
heating costs associated with energy loss through windows Common in cold to moderate climates
Laminated “safety” glass adds about 50% to the cost of a typical window. Cost may be increased for windows designed to resist
other forces such as hurricane winds. Low-E coatings save energy in most U.S. climates.
In a simulation of a home located in Boston, low-E coating saved $103 per year.
Translucent Wall Panels
Allow natural light to diffuse into homes and interior spaces
Translucent wall and ceiling panels are better insulators than normal windows Have solar and thermal
advantages Are as durable as normal wall
panels Available in different colors
Prototype Images
Translucent Wall Panels (clear legos)
Solar Tubes (straws)
Sun (yellow pool noodle)
FIG 1. Front View of Prototype
Cost Analysis
* Indicates item may be installed by the homeowner
Item Quantity Cost Total Item Cost
Solar Tubes*
6 $169.00 $1014.00
Window Glazing*
60ft2 $1 per square foot
$60.00
Translucent Wall Panels
26 ft2 $50 per square foot
$1300.00
Total $2374.00
Table 1. Cost Analysis
Summary and Conclusions
Though the initial cost of the items and installation may be expensive, in time they lead to reduced energy consumption. Over a relatively short period of time the conservation of energy leads to savings that are worth the initial cost.
References
Energy Center of Wisconsin. “Daylighting Collaborative.” Accessed 11/30/08 http://daylighting.org/
U.S. Dept. of Energy. “Energy Efficiency.” Accessed 11/28/08 http://www.energy.gov/energyefficiency/ind
ex.htm Toolbase Services. Accessed 11/27/08
http://www.toolbase.org/index.aspx